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annotate src/audio/mme/SDL_mmeaudio.c @ 956:4263beff9e38

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Date: Mon, 30 Aug 2004 18:20:25 +0200 From: Joost Baas Subject: why call arts artsc? I, and a few other people at the mplayer-docs-mailinglist were wondering why you decided to call arts artsc. I understand usually users have nothing to do with libsdl, just developers, but because you can choose the audio-driver being used by mplayer, one of which is sdl, and you can also choose the sdl subdriver, it is necessary to have a well-known or logical name. artsc is not the logical choice, and it's very hard to look up the right name if you don't know what you're looking for.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 17 Sep 2004 13:25:06 +0000
parents b8d311d90021
children 3692456e7b0f
rev   line source
654
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1 /*
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2 SDL - Simple DirectMedia Layer
769
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3 Copyright (C) 1997-2004 Sam Lantinga
654
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Tru64 UNIX MME support */
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24 #include "SDL_mmeaudio.h"
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25
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26 static BOOL inUse[NUM_BUFFERS];
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27
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28 /* Audio driver functions */
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29 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec);
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30 static void MME_WaitAudio(_THIS);
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31 static Uint8 *MME_GetAudioBuf(_THIS);
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32 static void MME_PlayAudio(_THIS);
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33 static void MME_WaitDone(_THIS);
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34 static void MME_CloseAudio(_THIS);
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35
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36 /* Audio driver bootstrap functions */
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37 static int Audio_Available(void)
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38 {
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39 return(1);
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40 }
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41
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42 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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43 {
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44 if ( device ) {
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45 if ( device->hidden ) {
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46 free(device->hidden);
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47 device->hidden = NULL;
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48 }
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49 free(device);
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50 device = NULL;
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51 }
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52 }
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53
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54 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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55 {
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56 SDL_AudioDevice *this;
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57
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58 /* Initialize all variables that we clean on shutdown */
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59 this = malloc(sizeof(SDL_AudioDevice));
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60 if ( this ) {
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61 memset(this, 0, (sizeof *this));
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62 this->hidden = malloc((sizeof *this->hidden));
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63 }
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64 if ( (this == NULL) || (this->hidden == NULL) ) {
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65 SDL_OutOfMemory();
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66 if ( this ) {
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67 free(this);
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68 }
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69 return(0);
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70 }
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71 memset(this->hidden, 0, (sizeof *this->hidden));
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72 /* Set the function pointers */
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73 this->OpenAudio = MME_OpenAudio;
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74 this->WaitAudio = MME_WaitAudio;
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75 this->PlayAudio = MME_PlayAudio;
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76 this->GetAudioBuf = MME_GetAudioBuf;
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77 this->WaitDone = MME_WaitDone;
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78 this->CloseAudio = MME_CloseAudio;
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79 this->free = Audio_DeleteDevice;
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80
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81 return this;
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82 }
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83
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84 AudioBootStrap MMEAUDIO_bootstrap = {
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85 "waveout", "Tru64 MME WaveOut",
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86 Audio_Available, Audio_CreateDevice
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87 };
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88
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89 static void SetMMerror(char *function, MMRESULT code)
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90 {
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91 int len;
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92 char errbuf[MAXERRORLENGTH];
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93
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94 sprintf(errbuf, "%s: ", function);
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95 len = strlen(errbuf);
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96 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
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97 SDL_SetError("%s",errbuf);
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98 }
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99
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100 static void CALLBACK MME_CALLBACK(HWAVEOUT hwo,
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101 UINT uMsg,
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102 DWORD dwInstance,
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103 LPARAM dwParam1,
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104 LPARAM dwParam2)
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105 {
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106 WAVEHDR *wp = (WAVEHDR *) dwParam1;
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107
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108 if ( uMsg == WOM_DONE )
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109 inUse[wp->dwUser] = FALSE;
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110 }
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111
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112 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec)
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113 {
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114 MMRESULT result;
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115 int i;
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116
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117 mixbuf = NULL;
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118
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119 /* Set basic WAVE format parameters */
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120 shm = mmeAllocMem(sizeof(*shm));
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121 if ( shm == NULL ) {
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122 SDL_SetError("Out of memory: shm");
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123 return(-1);
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124 }
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125 shm->sound = 0;
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126 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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127
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diff changeset
128 /* Determine the audio parameters from the AudioSpec */
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diff changeset
129 switch ( spec->format & 0xFF ) {
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diff changeset
130 case 8:
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diff changeset
131 /* Unsigned 8 bit audio data */
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diff changeset
132 spec->format = AUDIO_U8;
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diff changeset
133 shm->wFmt.wBitsPerSample = 8;
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parents:
diff changeset
134 break;
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parents:
diff changeset
135 case 16:
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parents:
diff changeset
136 /* Signed 16 bit audio data */
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diff changeset
137 spec->format = AUDIO_S16;
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diff changeset
138 shm->wFmt.wBitsPerSample = 16;
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diff changeset
139 break;
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diff changeset
140 default:
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diff changeset
141 SDL_SetError("Unsupported audio format");
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diff changeset
142 return(-1);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
143 }
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diff changeset
144
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
145 shm->wFmt.wf.nChannels = spec->channels;
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diff changeset
146 shm->wFmt.wf.nSamplesPerSec = spec->freq;
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diff changeset
147 shm->wFmt.wf.nBlockAlign =
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diff changeset
148 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
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diff changeset
149 shm->wFmt.wf.nAvgBytesPerSec =
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diff changeset
150 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
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diff changeset
151
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
152 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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diff changeset
153 if ( spec->samples < (spec->freq/4) )
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154 spec->samples = ((spec->freq/4)+3)&~3;
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155
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diff changeset
156 /* Update the fragment size as size in bytes */
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diff changeset
157 SDL_CalculateAudioSpec(spec);
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158
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diff changeset
159 /* Open the audio device */
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diff changeset
160 result = waveOutOpen(&(shm->sound),
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diff changeset
161 WAVE_MAPPER,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
162 &(shm->wFmt.wf),
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diff changeset
163 MME_CALLBACK,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
164 NULL,
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diff changeset
165 (CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE));
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diff changeset
166 if ( result != MMSYSERR_NOERROR ) {
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diff changeset
167 SetMMerror("waveOutOpen()", result);
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diff changeset
168 return(-1);
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
169 }
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diff changeset
170
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diff changeset
171 /* Create the sound buffers */
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
172 mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size));
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diff changeset
173 if ( mixbuf == NULL ) {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
174 SDL_SetError("Out of memory: mixbuf");
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diff changeset
175 return(-1);
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diff changeset
176 }
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177
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diff changeset
178 for (i = 0; i < NUM_BUFFERS; i++) {
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diff changeset
179 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
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180 shm->wHdr[i].dwBufferLength = spec->size;
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diff changeset
181 shm->wHdr[i].dwFlags = 0;
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182 shm->wHdr[i].dwUser = i;
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183 shm->wHdr[i].dwLoops = 0; /* loop control counter */
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184 shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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185 shm->wHdr[i].reserved = 0;
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186 inUse[i] = FALSE;
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187 }
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188 next_buffer = 0;
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189 return 0;
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diff changeset
190 }
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191
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diff changeset
192 static void MME_WaitAudio(_THIS)
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193 {
755
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194 while ( inUse[next_buffer] ) {
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195 mmeWaitForCallbacks();
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196 mmeProcessCallbacks();
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197 }
654
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198 }
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199
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diff changeset
200 static Uint8 *MME_GetAudioBuf(_THIS)
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diff changeset
201 {
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diff changeset
202 Uint8 *retval;
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diff changeset
203
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
204 inUse[next_buffer] = TRUE;
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diff changeset
205 retval = (Uint8 *)(shm->wHdr[next_buffer].lpData);
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diff changeset
206 return retval;
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diff changeset
207 }
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diff changeset
208
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
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diff changeset
209 static void MME_PlayAudio(_THIS)
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diff changeset
210 {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
211 /* Queue it up */
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
212 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
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parents:
diff changeset
213 next_buffer = (next_buffer+1)%NUM_BUFFERS;
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diff changeset
214 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
215
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
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diff changeset
216 static void MME_WaitDone(_THIS)
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parents:
diff changeset
217 {
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
218 MMRESULT result;
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parents:
diff changeset
219 int i;
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diff changeset
220
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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parents:
diff changeset
221 if ( shm->sound ) {
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diff changeset
222 for (i = 0; i < NUM_BUFFERS; i++)
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diff changeset
223 while ( inUse[i] ) {
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224 mmeWaitForCallbacks();
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225 mmeProcessCallbacks();
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diff changeset
226 }
654
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diff changeset
227 result = waveOutReset(shm->sound);
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diff changeset
228 if ( result != MMSYSERR_NOERROR )
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diff changeset
229 SetMMerror("waveOutReset()", result);
755
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230 mmeProcessCallbacks();
654
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diff changeset
231 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
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diff changeset
232 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
233
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
234 static void MME_CloseAudio(_THIS)
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diff changeset
235 {
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diff changeset
236 MMRESULT result;
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parents:
diff changeset
237
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238 if ( mixbuf ) {
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diff changeset
239 result = mmeFreeBuffer(mixbuf);
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diff changeset
240 if (result != MMSYSERR_NOERROR )
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parents:
diff changeset
241 SetMMerror("mmeFreeBuffer", result);
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diff changeset
242 mixbuf = NULL;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 }
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diff changeset
244
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 if ( shm ) {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 if ( shm->sound ) {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
247 result = waveOutClose(shm->sound);
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diff changeset
248 if (result != MMSYSERR_NOERROR )
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diff changeset
249 SetMMerror("waveOutClose()", result);
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250 mmeProcessCallbacks();
654
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diff changeset
251 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
252 result = mmeFreeMem(shm);
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diff changeset
253 if (result != MMSYSERR_NOERROR )
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 SetMMerror("mmeFreeMem()", result);
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 shm = NULL;
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258